Two-electron spin correlations in precision placed donors in silicon

Photomodulated electron-spin resonance in amorphous silicon

Quantum Computation with Electron Spins of Phosphorous Donors in Silicon

The discovery of efficient quantum algorithms a decade ago has shown that a quantum computer encoding and processing information quantum mechanically, can solve important problems intractable with conventional computers. The invention of quantum error correction principle, makes quantum computation possibly fault-tolerant against the decoherence of information carriers. Thereafter, intensive re...

Electron Spin Coherence of Phosphorus Donors in Isotopically Purified Si

We investigate spin coherence time of electrons bound to phosphorus donors in silicon single crystals, employing a pulsed electron paramagnetic resonance technique. The samples were isotopically controlled so that they may possess different concentrations (about 5% and 100%) of 29Si, which is the only non-zero-spin (spin-1/2) stable isotope of Si. Both 29Siconcentration dependence and orientati...

Spin Correlations in the Two - Dimensional Spin - 5 / 2 Heisenberg

We report a neutron scattering study of the instantaneous spin correlations in the two-dimensional spin S = 5/2 square-lattice Heisenberg antiferromagnet Rb2MnF4. The measured correlation lengths are quantitatively described, with no adjustable parameters, by high-temperature series expansion results and by a theory based on the quantum self-consistent harmonic approximation. Conversely, we fin...

Block-Spin Approach to Electron Correlations

We consider an expansion of the ground state wavefunction of quantum lattice many-body systems in a basis whose states are tensor products of block-spin wavefunctions. We demonstrate by applying the method to the antiferromagnetic spin-1/2 Heisenberg chain that by selecting the most important many-body states the technique affords a severe truncation of the Hilbert space while maintaining high ...